High-resolution X-ray synchrotron powder diffraction studies under high-pressure conditions are reported for the ordered double perovskite Ba 2BiSbO6. Near 4 GPa, the oxide undergoes a pressure-induced phase transition. The symmetry of the material changes during the phase transition from space group R3̄ to space group I2/m, which is consistent with a change in the octahedral tilting distortion from an a -a-a- type to a0b-b - type using the Glazer notation. A fit of the volume-pressure data using the Birch-Murnagaham equation of state yielded a bulk modulus of 144(8) GPa for the rhombohedral phase.
Bibliographical noteFunding Information:
Work at Brookhaven is supported by the US Department of Energy, Division of Materials Sciences, under Contract DE-AC02-98CH10886. Financial support from the Department of Energy through Grant DE-FG02-04ER46122 and the National Science Foundation through Grant DMR:0450103 is gratefully acknowledged.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Condensed Matter Physics
- Physical and Theoretical Chemistry
- Inorganic Chemistry
- Materials Chemistry